在Spring Boot中连接到多个数据库
我需要在项目中连接到两个数据库。因此,我创建了两个配置文件。
@Configuration@EnableTransactionManagement
@EnableJpaRepositories( basePackages = {"com.virat.webservices.datastore.v1.Repo" } )
@EntityScan("com.virat.webservices.datastore.v1.Model")
public class V1DBConfig {
@Primary
@Bean( name = "dataSource" )
@ConfigurationProperties( prefix = "v1.datasource" )
public DataSource dataSource()
{
return DataSourceBuilder.create().build();
}
@Primary
@Bean( name = "entityManagerFactory" )
public LocalContainerEntityManagerFactoryBean entityManagerFactory( EntityManagerFactoryBuilder builder,
@Qualifier( "dataSource" ) DataSource dataSource )
{
return builder.dataSource(dataSource).packages("com.virat.webservices.datastore.v1.Model")
.persistenceUnit("db1").build();
}
@Primary
@Bean( name = "transactionManager" )
public PlatformTransactionManager transactionManager(
@Qualifier( "entityManagerFactory" ) EntityManagerFactory entityManagerFactory )
{
return new JpaTransactionManager(entityManagerFactory);
}
}
和
@Configuration@EnableTransactionManagement
@EnableJpaRepositories( entityManagerFactoryRef = "v2EntityManagerFactory", transactionManagerRef = "v2TransactionManager", basePackages = {
"com.virat.datastore.repository" } )
@EntityScan( "com.virat.datastore.model" )
public class V2DBConfig {
@Bean( name = "v2DataSource" )
@ConfigurationProperties( prefix = "spring.datasource" )
public DataSource dataSource()
{
return DataSourceBuilder.create().build();
}
@Bean( name = "v2EntityManagerFactory" )
public LocalContainerEntityManagerFactoryBean barEntityManagerFactory( EntityManagerFactoryBuilder builder,
@Qualifier( "v2DataSource" ) DataSource dataSource )
{
return builder.dataSource(dataSource).packages("com.virat.model")
.persistenceUnit("db2").build();
}
@Bean( name = "v2TransactionManager" )
public PlatformTransactionManager barTransactionManager(
@Qualifier( "v2EntityManagerFactory" ) EntityManagerFactory barEntityManagerFactory )
{
return new JpaTransactionManager(barEntityManagerFactory);
}
}
然后我将application.properties
文件配置为
spring.datasource.type=com.zaxxer.hikari.HikariDataSourcespring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/db2? useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=fal. se&serverTimezone=UTC&useSSL=false
spring.datasource.username=root
spring.datasource.password=
#spring.datasource.pool.size=20
v1.datasource.driver-class-name=com.mysql.jdbc.Driver
v1.datasource.url=jdbc:mysql://localhost:3306/db1? useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=fal. se&serverTimezone=UTC&useSSL=false
v1.datasource.username=root
v1.datasource.password=
#v1.datasource.pool.size=20
spring.jpa.properties.hibernate.id.new_generator_mappings=false
v1.jpa.properties.hibernate.id.new_generator_mappings=false
#spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
但是,当我运行该应用程序时,引发了以下异常。
***************************APPLICATION FAILED TO START
***************************
Description:
Field entityManager in com.highpeak.tlp.webservices.services.impl.TaskServiceImpl required a single bean, but 2 were found:
- org.springframework.orm.jpa.SharedEntityManagerCreator#0: defined by method 'createSharedEntityManager' in null
- org.springframework.orm.jpa.SharedEntityManagerCreator#1: defined by method 'createSharedEntityManager' in null
Action:
Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed
org.springframework.boot.diagnostics.LoggingFailureAnalysisReporter org.springframework.boot.diagnostics.LoggingFailureAnalysisReporter:42 -
***************************
APPLICATION FAILED TO START
***************************
Description:
Field entityManager in com.highpeak.tlp.webservices.services.impl.TaskServiceImpl required a single bean, but 2 were found:
- org.springframework.orm.jpa.SharedEntityManagerCreator#0: defined by method 'createSharedEntityManager' in null
- org.springframework.orm.jpa.SharedEntityManagerCreator#1: defined by method 'createSharedEntityManager' in null
Action:
Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed
Disconnected from the target VM, address: '127.0.0.1:56875', transport: 'socket'
Process finished with exit code 1
我无法识别出什么错误。我有两个模块。一个数据库的repository
and
entity
类在一个模块中,另一个数据库的类在另一个模块中。这引起问题吗?
我的 TaskServiceImpl.java
package com.virat.webservices.services.impl;@Service
public class TaskServiceImpl implements TaskService {
private static final Logger LOGGER = LoggerFactory.getLogger(TaskServiceImpl.class);
@Autowired
@PersistenceContext(unitName = "v2EntityManagerFactory")
private EntityManager entityManager;
@Value( "${file.base.path}" )
private String basePath;
@Value( "${application.domain}" )
private String applicationDomain;
@Value( "${application.protocol}" )
private String applicationProtocol;
@Value( "${server.port}" )
private String serverPort;
@Override
@SuppressWarnings( "unchecked" )
@Transactional( rollbackOn = DataException.class )
public Integer doSomething( SomeObject someObject,
UserAccessDetails userAccessDetails ) throws DataException
{
try
{
// Do input validations
if( NullEmptyUtils.isNull(userAccessDetails) || NullEmptyUtils.isNull(someObject) )
{
throw new DataException(GeneralConstants.EXCEPTION, GeneralConstants.NULL_INPUT_ERROR,
HttpStatus.BAD_REQUEST);
}
// Creates a native mysql query based on the contents of lawyerDiscoveryParamsBean
/* Should be replaced with criteria API */
String generatedQuery = DynamicQueryGenerator.getDynamicQuery(someObject, owner);
LOGGER.info("Generated query: {}", generatedQuery);
Query executableQuery = entityManager.createNativeQuery(generatedQuery, UserModel.class);
List<UserModel> userModels = executableQuery.getResultList();
if( userModels.isEmpty() )
{
return 0;
}
return 1;
}
catch( DataException e )
{
LOGGER.error(GeneralConstants.ERROR, e);
throw e;
}
catch( Exception e )
{
LOGGER.error(GeneralConstants.ERROR, e);
throw new DataException(GeneralConstants.EXCEPTION, GeneralConstants.SOMETHING_WENT_WRONG,
HttpStatus.INTERNAL_SERVER_ERROR);
}
}
}
回答:
在中V1DBConfig.java
,注释@EnableJpaRepository
实际上应该是这样的,
@EnableJpaRepositories( entityManagerFactoryRef = "entityManagerFactory", transactionManagerRef = "transactionManager", basePackages = { "com.virat.webservices.datastore.v1.Repo" } )
您已经在类中完成了配置V2DBConfig.java
(请看@EnableJpaRepository
注释)。在中做同样的事情V1DBConfig.java
。
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